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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b404689fb5ac00d8af0d35f39f4fd8fa6d6c2f61ae26dd26d138e20766032622' 
  AND token = 'cTB7U+m5FwPbWjFYR/w2YfLjmf1O3BhtM+WKrVIUwjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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