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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a5d64c2a546dfc31fb150eef6bd1c456c62f5a491cd36bd76f13a614055164d' 
  AND token = 'dqe303SMDqqufSUnNC/i2p5U7Qavhat0P2SJbRcMvW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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