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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dbec503a3b81c5eaa7e9f3732b75ea0d0477db63cf0f22b93cd358cb55614f1' 
  AND token = 'ZALt5w58Kt8z3Bzor5EGruEv/uKVdVozEBv7vRpgdzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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