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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b8877879f448c25444eba370813da6507e03288ec56580bb0b3a98984509e2' 
  AND token = 'vx0nMsoPT9wX0vyGbybdhqdR/Rc1PQQhL9E1j6vB/j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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