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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ef70a1128ab27c58b449860bbf6f1617672354578e714a5aefe2190667c27d' 
  AND token = 'bwhtMt6hNg8noorILTiCeULsLB5f87kQsDGXl4g+xBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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