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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07bd3fe4e2a6aba9fbede4772530b3620b234c4ddec7d7d717196fcbcc7cf97' 
  AND token = 'STM43Bmg9b9P+d5nkVUJz3nmM0bcy5b2tlIaz0ni82A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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