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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3149dd3e755e38ad39f54ca5f7958d3fcfa3add8d6bcc58c5ce11ff035e75d4' 
  AND token = '3ubNlVyg0GSZPJSezYqvhF39hE85sTx3efFdzXO/TpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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