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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a888d07d5d45568973d1d04df5f2f3689b46419650c60068133b0b40109b36' 
  AND token = '3N4WYCxy8MGpSxd9bj/VUs2r8Ls0fv0NghPSMybq/Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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