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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be7ffe85aff13c769076c6e0356ac79aa4592941c5f3203c0f1a6d410a2ed38' 
  AND token = 'Gh09RwHk+PgyhfMCuXoT2OmOolWZcgOTX/L8ML+L+QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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