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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfdc02d081912829a8d66d9c8e2111ffaf0c8281141e9fe39d3ed2fd6ec49e7b' 
  AND token = 'QXWZcx3WbVPNEJPlGBNsKmNPWRaQdxAl86pcVUKLjPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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