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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5c564a3c58530ee707a9bd3764c15a469f4387ee90aab1365b9b95ab74721a' 
  AND token = 'dujjOBJMfuDhIovoB/eb9qkqsvKUcDhF1XaeGkONPkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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