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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec31f5dde9930264c392a0ec76e0339eecf3f5687ad52b64616306a78e371eac' 
  AND token = 'ttSF67ZYqX/mWNskepjPnf+aMQCInmssRJfwsqwWjbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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