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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f70c1b17d7fede76e1100ea8b15af3a9f6f49bb47f7885b6eef3d174d29a655' 
  AND token = 'cTOBstGD1+X1L7HV4wxtAwSm5MCudVwpUJbUrW5EcYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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