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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec58a644d6631c934fa43bdc9a258e6ea7253330787f43ee6f56f96b9e45d1ef' 
  AND token = 'xD+ZzHuZcEHGGUNqEJ0zaP20Lu0HNm/bktNS0DhUyYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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