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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3e52a1a757de2915691db7084e32acfd6b26b4a07c81392dc43b6c46897391a' 
  AND token = '+EJNVsf9wcEtqhbsU9GBwLd2WRA6DaGnv70CHnVjfEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}