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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1567081aebc0e664144f5755a09010b0dfdd7c4e64ee162ef50e0107ec01ae81' 
  AND token = '7CH6w7v0GNBj3Dgv1zfLMnYWazJf+vEdeE8FUA4llrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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