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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e7887dc8d31d407dd383933cdc76af87c7ea6a14476f337b161b97c094828f' 
  AND token = '5bSfqv8M/0uaSCTHzNIP/KuFjnKOgpuveWi6NFErTQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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