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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd29c4799860cb55b51a8a60e2f3d52a9859531793a6ca7bf97f4b4e81142a28' 
  AND token = 'C7xAxpI/QSgsrQH3ABs2RkxMKTSS1W2CCEGlgfUJNPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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