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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f84bf9663b898636065bc7f39ab5f0b36b651b50a9ec9e3701f1ddcb0939efc' 
  AND token = 'm9/bbVkN+Yfto9YpAdX1r9pvgPXy6W8eVyjmuoefzxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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