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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2b9fa03a3a7e14622ffeb1835727d618e3a38c9afe60c9225dbd48e77ac757' 
  AND token = '6NbrqVJ0nI2XUf80aCrGzf3xtTNm27tXjv5aJEId5Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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