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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd48c538a6f7d09f9c95e37c01e0592bf2b7c01e154077dbdb79d197428952d' 
  AND token = 'zPI8Ul1/nNRm3lRvZjdqf3pP9y+TsWb7cWAg4ranvTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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