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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842bbab936d2eb3542fa33843dfdc075070b490aa618bd4f73daff5e8f80848e' 
  AND token = 'pKWKq+9dJt8zczbuhwM5rd7LOYkoiLWxtJ+khquDgs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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