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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c902a6b30add2c10a7ea324531d772f8a832f227951d33f480c74ea7bca29992' 
  AND token = '7UDDuhqpkc8D1XUidXWXNIJOh6L2SgXr+2vqNGc+8Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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