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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d63b802d21ea30930ccbe5e196f364d2ebf0e51c4380e3bbd616b0556558734' 
  AND token = 'pGvp0m1ES/E2wDNGwCM243fIOJ1Db4/KZE10pIn8tx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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