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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e0b715a3e10af138524614f8c7422635665b5097a57d09055c2658de2dc364' 
  AND token = '8esnYmjPYmqsiDR05F/nROeoYbqd8A6n3LyPauu1bIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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