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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eba20031a55791d2ac6c7a19567a2141731e4b692e4936516c3a23267c349dd' 
  AND token = 'kNejr7mGn5LOfjaYY9TYRib7WqJXdi6nYKTiLRwGWy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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