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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ac92940211d12167390c73fcc5782c99e963eb39cd8da331c224ed95d6f26f' 
  AND token = 'gpWFw7Wt6B8P5oUyI7vmx1rO77B+S3bM8eRSGgxPH+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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