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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0aa180029a989a668eaf81a81da6929a8ed31f0d74d0c532a621fb0c0054f95' 
  AND token = 'jjFz6YztIBK6XpXSVG6Xo3ofJShOJqDAWga+hFIT+po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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