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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a598ec53542712d6561ce564131cc85884bf6b066dc93d007b921fad9c339b' 
  AND token = 'gab4e2mVNAzCAvN+n4T1lXwy3T1nqJfnLqh92YIzHSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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