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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b05d0ded32b1b130e2901c2d62eb49bb6425575a6b40f7d2733378e74d0078' 
  AND token = '/qKirk6kM/ZolOu57kMyO+REHOJI5alg0X8MFlZJxFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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