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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5803b8e494dbfc202591cf3d38a39ffd35037d4c2e5997883b6a33ece36fe23' 
  AND token = '+4BOkb94IjHTYv4omAnzX+65dApdf7EN8imhBsf0vsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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