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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8c593a580ce2276d5eb9e0a6346ae488717abbaebac8003ac5f1f3774050bbb' 
  AND token = 'lHt4xGOQk7JIxMBVXfvqcrJRyM3UslhSa7glkELr3iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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