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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4bc1e7562272a991a8b0358df048976968436c916afbd899cbe894b62f820f7' 
  AND token = 'BEyqz8Ek0fCdEaVhVpO4m33HbGBzIi1SQrUHvFfnl+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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