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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fdadf1d205785ef9d61508cc15135f5b7eba827621f4c51fa35a04bcd2a6b68' 
  AND token = '7Uky8lpSQGgXYJqUYSfTZ23eGDhQftf/nzVofed7lWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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