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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b766f24cece7f86485dcc66eb90f088298f6ab41604e98e7cf9bf016c04cbc67' 
  AND token = '+SsRo2X87qBtUh1sZl5+9FscEtx4wPfW7W/V8JFdC5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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