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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ab7c48636a28ad0f733dc15a2e9a2e7b4bd427896e8ac6a342a1b3c7ab298e' 
  AND token = 'jnm076WqCD1+wEYcDigksHHRJQcLQprUVqxrJyf+K9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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