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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc74ff2af37b9ece297b6fb1553e327e87909e61e13f271293c59e9dcf076fea' 
  AND token = 'wc6J+V7CEwP2hgF7VuDetECid89JEbO3uu8JnuFtt9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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