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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81a2d019863c1ba65a9e817686c300ada1d54466d5f7a404ef8dc24372a14a27' 
  AND token = 'ohb4/G1ZGPpC9THY8RgcIVSOOg2nAt1kt99I7sEimXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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