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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe899101668539bb6c01d26606807a793160c17dce49c33b589e244e2c501f29' 
  AND token = 'j93NkF+29VUoV1cMWubbOxG1wmGrKUeLwgUde6gSHGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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