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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0238f443bb56f0481696efdf23808b8b261f03dd99503c0ede414cde777fa4c' 
  AND token = 'S3aoB5A4yzlEOb9+ksRASLPjkOEmVL/Q5CpkjEnHy3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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