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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b9cc78a9ab47cb556962dcf673d0c95bbd6f156d2e628d5fa0590ce662f2f9' 
  AND token = '+1chwTEgT845cyJEVpqMyMKvEtq/4We0i0u0C0ljD6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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