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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9baaa4e0c5aa8a3e8acdc8a2fb24325917969490bdbf926f209b251a41d77363' 
  AND token = 'PrgHXwm05sD7FpHu2Gm2t10/xaTvco9hSchYWtys1b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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