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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a1915cac309d0f47b73e6c37af16660c37ef56f4fdfb5798d6d5cedf82d7e6' 
  AND token = 'hMEpeIC+nRpY0qM6dA52nNDXn+wQR/Frr/Qd904wFZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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