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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a277c1376eca90b99d9e527510b1454b85f4b945ae8379c60b0c767939b14b82' 
  AND token = '3B/BMCzNhR3C8HXaVMsaqpKqFmyqmq5Af1vAisizAHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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