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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd3280e09db5ddb09218a2ad92a7313bc00b0e799cc0af887a93a2b9ce41dc8' 
  AND token = '5tjk+GJvoQQHJGn2HhObH8mvhpY5oUjH41bfQK041bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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