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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dcd1678c54a5d32d62772be52a89a68e90cde2461f6efc0b9f2599855f1fc5a' 
  AND token = 'H3AFb8ACDhKU/pSyemmNgDOZVTY/h7M2VsRLffmuxKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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