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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa7b857efc894545a3e9c8888a46a72799df7e32c0b7b2e5b751124e1b3cdf7' 
  AND token = 'ufqUjxcMXGxk9GunPCGVw0p9YSTLbyrtR4S079Fe82c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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