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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de8532ff21e397b979bd0ceef740e4a7554f1df991f5650defa5d711ab9095b2' 
  AND token = 'PWsA4KsXQMTIvT2/nvsuBZI0bhB6tYQcnmBGo3cE4kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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