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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee9fa2ae8c2c30ba3fdaf8f529ce7703acbca25f49d7e5488348d28aa1880c6' 
  AND token = 'rMjlvdBxuR0hTKq3gffjZUy1BU67Y/DI2ujDeT4jidE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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