SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e102bd6075993f4b90438f3a49063f0afc8f106958367058a7774aa3c0a7cccc' 
  AND token = 'QKZ7miXwrjaUx4jJPLzu/tLycVmpw4z2s23CbbSHwTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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