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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb698d8111619a921d00df77ea4a287291ef6ce751006f5b52be30a45ddc456' 
  AND token = 'hvrgO2FNwx8C4iwz/uKXJKEgsdnyfKiYhxt2sNLO4AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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