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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a3a71de5ca23a431135e86c2c8721703daabab4bfce8fbf2c6f8a928ba8d2c' 
  AND token = '5ZXxG4w3iyOVXJX6enh7eYazqDdCQVogkWhU5MnLNOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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