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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070ac90dc7618d22e7687619ba76397452bc71c29bb194012afa8ac5f1cdc338' 
  AND token = 'Ga/pAQdFCznIyEHCRYBSDm44y33mmeqMUblb4X0nk4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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