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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f16847c4bffd0fdf2a1116ef088ec1b9135aedd61c662280710cf2324cc2c7b2' 
  AND token = '9pnIf4EuxGyiYGbuGDplVpm7MvUwXBQRUjb2UJQat8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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