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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0567bb4511d6c2c05b8470d4b97076701f4a392ff0c9c42a833624cf4decb606' 
  AND token = '57uqUpLa9BytI7lc0/9D7idTwISEJ2282gl4cnl8v/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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